Charles a



(No Model.) l

C. A. PPLUGER.

ARG LAMP.

No. 539,392. Patented May 14, 1895.

UNITED STATES PATENT OEEICE.

CHARLES A. PFLUGER, OE CHICAGO, ILLINOIS, ASSIGNOR TO TI-IE STANDARDELECTRIC COMPANY, OF SAME PLACE.

ARC LAMP.

:BECIFICATION forming part of Letters Eatent N o. 539,392, dated May 14,1 895.

Application tiled April 5, 1894. Serial No. 506,428. (No model.)

To @ZZ whom t may concern:

Be it known that I, CHAELEs A. PFLUGER, a citizen of the United States,residing at Chicago, in the county of Cook and State of Illinois, haveinvented certain new and useful Improvements in Arc Lamps, of which thefollowing is a specification.

My invention relates to are lamps and has for its object to provide acheap, simple and convenient lamp, and particularly to avoid so far asmay be possible the necessity of complicated mechanism and the lihe. Itis illustrated in the accompanying drawings wherein my device is showndiagrammatically and conventionally.

The general subject of arc lamps is so well understood and has been sothoroughly iuyvestigated that I do not deem it necessary to more thanshow the material parts which are required for the illustration of myimprovements.

Figure I is an elevation of the parts. Fig. 2 is a detail.

Like parts are indicated by the same letters in the figures.

t will be assumed of course that there is a suitable supporting frameand the like.

A is a lifting magnet or solenoid in the main circuit and acting uponthe rod B which has secured to it the arc-shaped frame pieces C C, uponwhich the upper carbon tubes D D are placed. The magnet A is rigidlysupported on the platform E, which is rigid on the frame.

E G are the upper carbons which are loosely placed in the tubes D D andapproach each other at an angle, their lower ends being normally incontact.

II .I are plugs which move somewhat freely in the upper ends of the tubeand which are recessed to snugly receive the upper ends of the carbons EG. To these plugs lead the coiled conductors or conductor cords K Lwhich join at one extremity of the coil of the magnet or solenoid A.From the other extremity leads the conductor M to the binding post N.This constitutes the upper electrode and it may obviously be used withmany kinds of lower electrodes, but I have indicated the form which Iprefer to use.

O P are lower earbons approaching each other at an angle with theirpoints normally in contact and sliding loosely in the tubes R S. Eachcarbon is snugly fitted into a plug T U to which plugs are attached thecoil conductors or cords V W which join at the binding post.

Y Z are slots in the tubes R S through which project pins Y Z to whichpins are attached respectively the cords YZZ. The cord 6o Z2 passes overthe pulley Z3 and the cord Y2 over the pulley YS, and the two cords thenpass downwardly to the weight ZJ1 adapted to move vertically to theguide Z5. The pulleys Y3 ZS are supported on the shaft ZG which is 65rigidly carried on the frame Z7, itself rigid with the cylinders ortubes R S. This constitutes the lower electrode and it is obvious thatit may be used with many kinds of upper electrodes.' I have preferred tojoin these 7o two electrodes in one lamp, but I do not wish to belimited to the specific form or construction of apparatus here shown,for as before suggested I have only shown it as it werediagrammatieally; and I do not wish to be limited V tothe claims whichembrace all ofthe features, here shown when used together, for I may usesome of them apart from the others.

The lamp of course may be fitted with the usual cut-outs, and other suchdevices, and 8o the upper electrode might be of different form and mightbe fed in the usual way, and the lower electrode might be of differentform and might be stationary, or might be fed by other means than thosehere shown, as for example, 8 5 the usual electrode feeding devices ofarc lamps, or by means of a spring or other equivalent device.

A stop ZS limits the downward motion of the frame C C which carries theupper car- 9o bons and thus prevents the weight of said frame fromcausing said carbons to be forced upwardly into the tubes D D when thesolenoid is not energized.

The use and operation of my invention are as follows: The current havingbeen applied, the magnet or solenoid A is energized and the upperelectrode is raised from its contact with the lower electrode so as toestablish an arc. As the carbons consume, the feeding toc processproceeds as follows, referring first to the upper electrode: The twocarbons D D by other equivalents, as for example, aw'eight like thelower electrode, or springs and the i like. The current is carrieddirectly to the carbons and to each of them by means of the plugs intowhich the upper extremities of such carbons set. Thus a good contact ismade, and each carbon has an equally good contact so that the resistanceof each is equal.

These upper carbons or the upper electrode,

could of course be raised by hand or by the action of the current asdesired. With the electrode here shown t-he frame assumes a definite andfixed position when it is raised to establish `the arc, .though theremight be occasions when it would seem desirable to have more or less ofa feeding motion of the entire upper elect-rode, for instance, by theuse of a shunt magnet, to compensate for any possible variation in thearc.

Refer-ring now to the lower electrode, it is composed as here shown oftwo carbons feeding together and resting in tubes. Each carbonis seatedin a socket or plug, and the two carbons are forced upwardly andtogether at the point where the arc is established by means of aweightor equivalent Z4. Of course a spring could be used if desirable.This weight is supported by two cords which pass over the two pulleys inopposite directions and thence to the pins which project through thelongitudinal slots in the two lower electrode tubes.- These A,pins beingattached to ythe plugs :or sockets, of cou-rse 'th'e carbons are forcedupwardly. Where one lower carbon burns faster than the other, the cordattached to it slackens up and the weight has a tendency to tip on thatside, but being guided by the center rod,'the whole weigh'tis changed to-'the other carbon. Therefore both carbons are forced to burn equally.

I claiml. In an arc lamp the combination of two electrodes having eachtwo carbons at an acute angle with each other, means of feeding thecarbons of one electrode independent of each other and of separating theelectrode to establish the arc, means of feeding the carbons of theother electrode comprising a cord attached to each "carbon andpassi'ng'over pul leys, and a weight attached to the ends of said cords,whereby the carbons of the said electrode are forced to burn equally.

2. The combination in an arc lamp of two electrodes having-each twocarbons adapted to be fed towardeac-h other at an acute angle, means formoving the upper carbons simultaneously to establish the arc, and adevice for feeding the lower carbons comprising a weight, a rod vuponwhich said weight -is adapted to slide, cords connecting said weight andsaid carbons passing in opposite directions over two pulleys, the wholebeing arranged between the lower carbons, substantially as described.

CHARLES A. PFLUGER.

Witnesses:

WALTER J. GUNTHORP, ALICE H. GEDDES.

